Rack inserting mechanism



Feb. 29, 1944. w` F. BRUGMANN RACK INSERTING MECHANISM Original Filed April 25. 1936 rientra rea 29,1 1944 uNlTED STATES PATENT oFF-ica oem applicatie April z5, me, serai No.

76,454. Divided and this application July 11,I

1940, Serial No. 345,016

Claims. (Cl. ,ts-44) r//'f- Thisniiventlon-relates in general to printlng/rfiverftion/will beapparent as it isbetter understood from the following description, which,-

plate mounting devices, such as those employing the type of rack adapted to" in grooves therein disci my co-pending apwhen taken in connection with the accompanying drawing, discloses a preferred embodiment plicationerialfNiTiAii, led April 25, 1936, 5 thereof.

and issued August 6, 1940, as U. S. Letters Patent No. 2,210,749, and it relates moreparticularly to the apparatus for inserting such racks. The present application is a division of said Patent While the instant invention is clearly applicable to printing press plate cylinders and to plate supporting bases for flat bed presses, it is shown and described herein in conjunction with the former, since its advantages in such an installation are more readily apparent.

The prior art discloses the cutting of helical grooves in the circumferential surface of printing press cylinders ,within which register hooks In the drawing, n

Figure 14 is an elevational view. with parts broken away, of a printing plate cylinder and apparatus for inserting racks, embodying the 10 features of the instant invention, in helical grooves in the cylinder:

Figure 2 isa front elevational view, with the upper portion in vertical section, of the tool holding device of Fig. l:

Figure 3 is a side elevational view, partly in section, of the lower portion of the devicev of Fig. 2 in operative position in a groove of the cylinder; I

Figure 4 is a detail rear elevation of the rivetare adapted to be mounted, and the provisionv go ing roller: and

cooperate'to mollet/heN hooks longitudinally/of the groovesdnto and out of clamping engage- Figure 5 is a detail verticalxsection' of a portion I ofNtlie -printing plate Ycylinder showing a groove having a rack mounted therein.

Referring more particularly to the drawing,

ment with the usual printing plates. These prior reference numeral 2i indicates a printing Press art racks, however, and the methods employed in mounting them in the grooves in the cylinders have certain practical disadvantages which it is the purpose of the instant invention to overcome.

Heretofore the racks have been pushed or pulled longitudinally into 1'slots cutadjacent the bottom Aoi.' the grooves. Since the 'racks are subjected to great strain .by the driving elements plate supporting cylinder of, well-known construction having end bearing members 22 (Fig. 1). A plurality of spaced, parallel, helical grooves 23 'are cut in the circumferential surface of the cylinder 2| in the usual manner, and are preferably disposed at an angle of approximately 45 degrees to the longitudinal axis of the cylinder. ,Y i

The grooves 23 are constructed to receive any of the hooks both in; their initial registering suitable form of plate holding devis. Such 8S movements, and during airain"blt/heacti-annif the-printers-registerseok disclosedrinmy prior the impressionicylinderson the printing plates,

breakage of some of the teeth thereof naturally follow 'in the course of time. In the prior art 40 ments of the plate holding devices (not shown) devices it is then necessary -to remove the entire rack from the full length of the groove, even though but a small portion thereof has been damaged. To do this, the plate cylinder must be taken out of the press and shipped to the factory 4i!4 where the necessary tools and equipment are available to do the work, and, in the meantime,

the press is completely outof commission.

A principal object of my invention, therefore,

U. S. Letters Patent No. 2,124,728, issued July 26, 1938, and are provided on each side adjacent the top with longitudinal, under-cut recesses 2l (Figs. 3 and 5) within which the locking eleare adapted to be'positioned. At their' lower ends, the side walls of the grooves 2l are cut 'back or outwardly at a slight angle and for a short distance at 2l to provide a slightly laterally enlarged recess at the bottom of the grooves within which are mounted racks 2t adapted to be engaged by the driving gears ofthe printers register hooks.

-is the provision of novel apparatus for inserting 5,0 The ril-0B 23 'are Provided with teeth 2T on their upper surfaces formed integrally therewith.'

and with longitudinal, marginal recesses 2l on either side of and extending slightly below the root line or bottom portion vof the teeth 2l (Fig.

` Numerous other obiects and advantages 4of the sa 5). When the racks 2| are secured in PW in cylinder v2 l.

teeth 21 for the accumulation and drainage of foreign matter, and also facilitate the securing of the racks withinv the grooves 23 in a manner to be laterV described. The racks 23 'are also preferably provided with a substantially centrally l located, longitudinal recess or groove 29 in the bottom surface thereof for a purpose which will be explained hereinafter. i

For positioning the racks 26 in the grooves 23 Y and securing them in place, after the grooves face thereof. A pair of trun-nion supporting mem' bers 34 are secured to the bed of the planer 3| by thevusualT-Lbolts 35 mounted in T-slots 33. The trunnions 34 are adapted to receive the bearing members 22 of the plate Cylinder 2| to rotatably support the cylinder on the planer bed with its axis disposed longitudinally thereof.

i A If it is desired, a tensioning means of some sort niay be provided to'resiliently urge the cylinder 2| to rotate in a clockwise direction, as viewed from the rear of lthe planer 3|, or the right of Fig. -1, for a purpose to be later de scribed. Such a tensioning means is shown in Fig. 1 as comprising a coil or clock spring device 36 mounted on the bed of the planer 3|, and

having one end of a ilexible strap or cable 31 secured thereto, the other end of which is adapted 'to be wound around and secured in any suitable manner to one of the bearing members22 of the A handle 33. may be provided on the tensioning device 33 for winding up and controlling the operation of the spring therein.

rights 4|, between which the bed is adapted to reciprocate. cross-brace 42 mounted between the uprlghts 4| for vertical adjustment, cross-slide 43 mounted for lateral 4adjustment on the brace 42 by screw 44, and tool holder 45 pivotally mounted at 4l on the slide for forward swinging movements only relative thereto. A rack inserting tool, indicated .generally by reference numeral, is adapted to-be secured in any'suitwhich'is adapted to be engaged by the clamp". The body portionxil is provided with' an axial bore 52, having a decreased threaded portion 53 at its upper end.A An internally and ex ternally threaded collar or pressure member I4 is screwed into the reduced threaded portion 33 of the bore 52, and is provided with an angular headportion il. A rod 53 is'disposed within the longitudinal bore 52 of the body portion 3|, and is threaded adjacent its upper end for engage# which will behereinafter explained.

tive to the body pti :the bottom of l the groo'v 23,' these marginal recesses 23 form gutters alongvthe sides of the rounds the'rod 56, and is disposed within the bore 52. The lower end of the..coil spring 59 abuts against the upper end of a vertical cylindrical extension Sl'forming a part of a tool 5 carrier. indicated generally by reference numeral 62.

The cylindrical extension 6| is disposed within the lower part of the bore 52, and is provided witha bore $3 through which the lower .end of l0- the rod 58 extends. The extension 6|, and consequently the tool holder l2, is held'against rotation relative to the body portion 5I in any one of a plurality of predetermined positions by a setscrew i4, which is mounted in the cylinder '15 5|, and is adapted to engage within a selected one of a plurality of grooves 65 in the outer surface of the extension 3|. The grooves 65 may be spaced around the circumference of the extension '5| for a purpose Each of these grooves is of such a width tha theinnen \en\d of the screw 64 will-rmly engage its side walls,\and isof such a length as to permit limnea vertumevement of the w01 helder sz remoir'l. Referring more particularly to Fig. 3, it will be seen that lthe tool holder 62 comprises a rounded rear endportion 66, disposed immediately below the extension 6l, and a flattened o forwardly extending yoke portion 61. The rear portion 66 is provided with a vertical bore 63, which is co-axial with the Vbore Grin the. extension 6|. A cylindrical tool carrying member 6! is mounted for sliding movement within the bore 48. The upper end of the tool carrier 69 is -adapted to be engaged by the lower end of the rod 56. The tool carrier il is held against rotation relative to the tool holder 62 by a setscrew Y 'Il extending through the rear wall of the latter andgengaging within va short vertical slot or .15 AIt will be readily apparent that the cylindrical The planer 3| is provided with the usual upother means must be provided for limiting the vertical movement oftbese members.

The lower end of the tool carrier I! is formed to provide a narrow depending yoke portion 13 (Figs. 3 and 4). A double bladed riveting roller 14 is mounted on the lower end of the tool car g able manner, asbyp/u-clainp member neto the;

Y `forward face of the tool holder 4I. `Y

Referring to Figs. 2 t04, the rack inserting tool 4I comprises a cylindrical body portion 5|,

o0 the blades of the riveting roller 14 is provided with a plurality of circumferentially spaced teeth 1I. The teeth 13 are triangular in radial cross section (Fig. 4) with their outer surfaces being disposed at a lesser angle toa vertical plane than are their inner surfaces. The purpose of so .Y shaping the teeth of the riveting roller`14 will be later described. 'A pressure roller gear 11 is rotatably mounted on a cross shaft 13 extending through and supported by the lower forward end ment with the inner threads of the collar I4. The 70 of the yoke I'L Horizpntal. forwardly extending rod terminates at its upperend in'an angular head portion 51. -A collar I3 is disposed within Y the bore I2 surrounding the rod I4, and is pressed i vupwardly against the lowerend ofthe collar I4 guide bars 1l are mounted at their rear ends on the outer ends of the shaft 13, and are held against the outer surfaces of the yoke by retaining nuts 8| threaded on the outer ends of the by a compression coil spring 3l, whichpalso sur- 15 shaft 1l.

f .provides a means of micrometric The above described mechanism is used to in sert and secure the racks 26 within the bottom portion of the grooves 22 in the cylinder 2i in the following manner:

The cylinder 2i is rst mounted in the trunnions I4 with its axis extending longitudinally of the bed .of the planer. as shown in Fig. 1. The rack inserting tool 48 having been secured to the tool holder 46 of the planer and positioned directly above the axis of the cylinder 2|, the setscrew 84 is unscrewed to pemit the setting of the tool holder 82 at the same angle to a.4 vertical plane defined by the axes of the cylindrical body portion and the plate-holding cylinder 2i, as the grooves 23 are disposed relative to the same plane. For this reason a plurality of grooves 65 are provided in the outer surface of the extension 6I of the tool holder 62. Since it is substantially universal practice to .cut the this reason, .the guide roller 11 may also function asa final forming tool for the teeth 21 of the rack.: If itis desired, a suitable shoe may be secured to the tool holder i2 in advance of the guide roller 11 to relieve the guide roller from the The riveting roller 14 is positioned vertically f so that its teeth 18 will dig into the upper side of the racks26 are vertically disposed, and the racks are of sucha width as to permit them to readily slide downwardly into the grooves 23.

After they have been loosely postioned in the bottom of the grooves, downward and outward pressure on their upper surfaces adjacent their outer edges will force a'certain amount of metal into the angular recesses '25 Ato iirmlysecure them in the bottom ofthe grooves, as shown in Fig. 5.

One end of a rack 26 having been secured in the rearend of one of the grooves 23 by hand,

such portion of the groove 23 is brought beneath the guide roller 11, and the 'latter is lowered into this groove. The rack 28 extends loosely in front of the guide roller 11 and is maintained in linewith the groove 2 3 by .the forwardly extending guide bars 19.` The initial cross vertical adjustsurfaces of the rackdeflned by the recesses 28. 'I'he shape of the teeth 18 is such that this will result in a sideward deiiectiony of some of the metal into the inclined recesses 25 at the bottom of the groove 23. The particular shape of the riveting roller I4 will also insure against any damage being done to the teeth 21 of the rack in this riveting operation.

It is thought that the invention and many of its attendant advantages will be understood from the foregoing description, and it will be ,apparent that various changes may be made in the form, construction and arrangement of the parts without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the form hereinbefore described being merely a preferred embodiment thereof.

' I claim:

1. A device for inserting ea toothed rack in a deformation of said teeth during such operation,

ment of the rivetingl tool 48 down linto the selected groove 23 is had Vby moving the tool holder 45. Any desired degree of downward pressure may. be maintained on the tool holder 62, and consequently the guide 'roller 11, byv adjusting the collar 54 to varyr the tension in Athe coil spring |59.

The arrangement the guide roller 111s resiliently and not positively held against vertical movements. Since the cylindrical body portion 5I is rigidly held by the clamp 49, vertical movement of the riveting roller 1,4 is positively prevented by the rod 56 abutting against the tool carrier 68. This rod adjustment for the riveting roller 14. l

The bed kof theplaner 3i is now moved rearwardly (to-the right, in Fig. 1), which carries the cylinder 2l past the riveting tool 48. v Since the guide roller 11 is positioned in the selected groove 23, the cylinder 2| will be rotated by the guide of these parts is such thatV said first and second means being movable relative to eachotherlongitudinally of 'said groove, and means for displacing desired longitudinal edge portions of said rack without altering the `shape of said teeth 'to rigidlyvsecure the rack in said groove.

, 2. A device for inserting a toothed rack in ,a groove in a printing plate supporting member, comprising means for supporting said member and moving it longitudinally yof said groove, means for engaging theteeth of said rack to seat 46 the latter in said groove as the plate supporting member is moved v'by said flrst means and to maintain said teeth in their original shape during such operation, and means adjustable relative to said last means for displacing desired 1ongitudinai edge portions of said rack withoutaltering the shape of said teeth to rigidly secure the rack -in said groove.

3. A device for inserting a rack in a helical groove in a printing plate supporting cylinder,

comprising means for rotatablysupporting said cylinder, and means for seating therack in the groove and displacing desired portions thereof to rigidly secure 'therack to said cylinder, said first rotation of said cylinder during vrelative moveand second means being movable relative to each other Vaxially of said cylinder, and Vsaid second means being engageable with said groove to cause ment of said first and second means to maintain the groove and that portion `of the rack being inserted thereinin proper-relative relationship.

` 4. A device for inserting a rack in an underl.. cut, helical groove in a printing plate supporting roller as it is moved rearwardly. -To assist in this f rotative movement of the cylinder 2l, thev tensioning means 36 may be employed as' above described. As vthe cylinder 2| is moved past. the

riveting tool 48, the guide roller 11 insures proper positioning of the rack 28 in the bottom of the l groove 23, since the teeth oi.' the roller are formed to accurately mesh with those of the rack. For

cylinder, comprising means for rotatably supporting said cylinder andaxially moving the same, and means ,adjustable relative to said rst means for'engagement with said groove and normally stationary relative thereto for seatingthe rack in the groove and displacing portions thereof into the undenout Portions vofsaici groove to rigidly secure the same therein, said second side pressure developed in rotating the cylinder means also causing said cylinder-to rotate as it is moved axially by said iirst means to maintain engagement with said groove. f

5. A device for mounting' a metal/strip in a groove, comprising means for guiding said strip into and properly positioning the same in the bottomA of said'grove, and means movable with said rst means and adjustable relative thereto for forcing portions of said strip against a wall of said groove to rigidlysecure the strip in the groove.

6. A device for mounting an elongated metal ing member,v a tool holder supportedgby and` mounted for limited movement relative to said member, a second tool holder supported by and mounted for-limited movement relative to said g5 cylinder as it is moved axially by said first means iirst tool holder, and means mounted on said p supporting member for adjusting said second'tool holder relative thereto and relative. to said iirst tool'holder,l Y

8. In a device of the class described, a As'upporting member, a tool holder supported by and mounted for limited movement relative to said said tool holder relative to said member. a second tool holder supported by and mounted forl limited movement relative to said rst tool hold-i er, and'means Ior'supersedins the' action of said spring means imregard to said second tool holder to'adiust the latter relative .to said supporting member and to limit upward movement of said second tool holder against the action oi' said spring means;V I

i0 9. A m01 for riveting racks into the bottom of vunder-cut grooves in a printing plate supporting member, comprising teeth adapted tou straddle the teeth on a rack, which are centrally disposed v'and upstandingd'rom the top4 of the rack, the

15 teeth onthe tool being triangular in cross section with the outer surfaces at a lsteeper angle than the inner surfaces; whereby downward pressure on the'tool will displace portions of said rack into the under-cut portions of its associated groove.

gg 10. A device for inserting a rack in a'helical groove in a printing plate supporting'cylinder, comprising means for rotatably supporting said .cylinder-and axially moving the same. means f or engagingv said groove to caus'ecrotation of said 30 cylinder to rotate toI aid in maintaining said groove and that portion of the rack' being inserted therein in proper relative relationship.

WILLIAM r'. nationaler. 

